21126958680 has 32 divisors (see below), whose sum is σ = 63380876400. Its totient is φ = 5633855616.

The previous prime is 21126958679. The next prime is 21126958717. The reversal of 21126958680 is 8685962112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88028875 + ... + 88029114.

Almost surely, 2^21126958680 is an apocalyptic number.

21126958680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21126958680 is an abundant number, since it is smaller than the sum of its proper divisors (42253917720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21126958680 is a wasteful number, since it uses less digits than its factorization.

21126958680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176058003 (or 176057999 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 48.

The spelling of 21126958680 in words is "twenty-one billion, one hundred twenty-six million, nine hundred fifty-eight thousand, six hundred eighty".